Punching machine



FIG. 1 is a front left perspective view of a punching machine showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a rear perspective view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom side elevation view thereof;

FIG. 8 is a front rihgt perspective view thereof;

FIG. 9 is a back left perspective view thereof; and,

FIG. 10 is a back right perspective view thereof.

The broken lines in the drawings depict unclaimed environmental subject matter. 

The ornamental design for a punching machine, as shown. 